What are the use and how do you set the small wheels on the corners of the mowing deck. The church has a donated Scotts 42' mower and the guy that does the mowing, bolted the wheels on using the lowest hole. They scuff and bend the brackets. We have rewelded and straightened the brackets and replaced the wheels. He claims that they ride on the ground to mow evenly. I don't think they should be set as low as they are. Please help...Thanks